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Lateralization visual field

Haruki Tokida, Yuhei Kanaya, Yutaka Shimoe, Shigeru Yamori, Koichi Tagawa, Masaru Kuriyama
We report a case of a 55-year-old man who developed acute-onset narrowing of his visual field. He showed right homonymous hemianopsia without any other neurological symptoms and signs. Brain CT and MRI showed localized hemorrhage (about 1.6 ml) in the left lateral geniculate body (LGB). A cerebral angiography showed no vascular anomalies of cerebral vessels, and the left anterior choroidal artery and left lateral posterior choroidal artery could be visualized well. He had hypertension, polycythemia and dyslipidemia and was a habitual smoker and an alcoholic...
October 21, 2016: Rinshō Shinkeigaku, Clinical Neurology
Tania Dukic Willstrand, Thomas Broberg, Helena Selander
BACKGROUND: To maintain the mobility of older people in later life, it is essential to sustain their autonomy; however, driving is a complex task, requiring a large range of visual, psychomotor and cognitive abilities. Subsequently, a key issue is to measure and evaluate the fitness to drive of older drivers. Several methods have been proposed, among them the useful field of view (UFOV) test. OBJECTIVE: The present study aimed to identify driving characteristics in older drivers and the relationship between the UFOV test and the on-road driving results...
October 21, 2016: Gerontology
Giulia Prete, Mara Fabri, Nicoletta Foschi, Luca Tommasi
We investigated hemispheric asymmetries in categorization of face gender by means of a divided visual field paradigm, in which female and male faces were presented unilaterally for 150 ms each. A group of 60 healthy participants (30 males) and a male split-brain patient (D.D.C.) were asked to categorize the gender of the stimuli. Healthy participants categorized male faces presented in the right visual field (RVF) better and faster than when presented in the left visual field (LVF), and female faces presented in the LVF than in the RVF, independently of the participants' sex...
October 13, 2016: Neuroscience
Jenna Dean, Carmen J Hansen, Justin Westhuyzen, Brett Waller, Kirsty Turnbull, Maree Wood, Andrew Last
INTRODUCTION: Inverse-planned intensity modulated radiation therapy (IP-IMRT) has potential benefits over other techniques for tangential intact breast radiotherapy. Possible benefits include increased homogeneity, faster planning time, less inter-planner variability and lower doses to organs at risk (OAR). We therefore conducted a pilot study of previously treated intact breast patients to compare the current forward-planned 'field-in-field' technique (FP-IMRT) with an IP-IMRT alternative...
July 18, 2016: Journal of Medical Radiation Sciences
Rens Verhagen, P Richard Schuurman, Pepijn van den Munckhof, M Fiorella Contarino, Rob M A de Bie, Lo J Bour
OBJECTIVE: The correspondence between the anatomical STN and the STN observed in T2-weigthed MRI images used for deep brain stimulation (DBS) targeting remains unclear. Using a new method, we compared the STN borders seen on MRI images with those estimated by intraoperative microelectrode recordings (MER). APPROACH: We developed a method to automatically generate a detailed estimation of STN shape and the location of its borders, based on multiple-channel MER measurements...
October 14, 2016: Journal of Neural Engineering
Douglas A Luke, Ana A Baumann, Bobbi J Carothers, John Landsverk, Enola K Proctor
BACKGROUND: Training investigators for the rapidly developing field of implementation science requires both mentoring and scientific collaboration. Using social network descriptive analyses, visualization, and modeling, this paper presents results of an evaluation of the mentoring and collaborations fostered over time through the National Institute of Mental Health (NIMH) supported by Implementation Research Institute (IRI). METHODS: Data were comprised of IRI participant self-reported collaborations and mentoring relationships, measured in three annual surveys from 2012 to 2014...
October 13, 2016: Implementation Science: IS
Julian P Knopf, Patrick R Hof, Helmut H A Oelschläger
We investigated the morphology of four primary neocortical projection areas (somatomotor, somatosensory, auditory, visual) qualitatively and quantitatively in the Indian river dolphins (Platanista gangetica gangetica, P. gangetica minor) with histological and stereological methods. For comparison, we included brains of other toothed whale species. Design-based stereology was applied to the primary neocortical areas (M1, S1, A1, V1) of the Indian river dolphins and compared to those of the bottlenose dolphin with respect to layers III and V...
October 13, 2016: Brain, Behavior and Evolution
Aminda J O'Hare, Ruth Ann Atchley, Keith M Young
The motivated attention network is believed to be the system that allocates attention toward motivationally relevant, emotional stimuli in order to better prepare an organism for action [Lang, P. J., Bradley, M. M., & Cuthbert, B. N. (1997). Motivated attention: Affect, activation, and action. In P. J. Lang, R. F. Simons, M. Balaban, & R. Simons (Eds.), Attention and orienting: Sensory and motivational processes (pp. 97-135). Psychology Press]. The late positive potential (LPP), an event-related potential (ERP) that is a manifestation of the motivated attention network, has not been found to reliably differentiate the valence of emotionally relevant stimuli...
October 12, 2016: Laterality
Matthew Yalizis, Kevin Kruse, Arnaud Godenèche
Proper visualization is of paramount importance during arthroscopic rotator cuff repair. We propose a technique that significantly improves the visualization of the rotator cuff when viewing from the anterolateral or lateral portals. This "panorama" view is obtained by a release of the deep layer of the deltoid fascia, which in turn increases the space between the humerus and the deltoid muscle. This release increases the volume of the subdeltoid bursa, secondarily increasing the field of view of the subacromial space with the camera viewing from the anterolateral or lateral portals...
August 2016: Arthroscopy Techniques
Jun Xing, Yijun Luo, Xiaoli Wang, Min Gao, Mingping Sun, Xiuping Ding, Tingyong Fan, Jinming Yu
PURPOSE: Definitive chemoradiation therapy remains the standard of care for patients with localized esophageal carcinoma who choose nonsurgical management. However, there is no consensus regarding delineation of the nodal clinical target volume (CTVn), especially for lower cervical lymph nodes. This study aimed to map the location of metastatic supraclavicular lymph nodes in thoracic esophageal carcinoma patients with supraclavicular node involvement and generate an atlas to delineate the CTVn for elective nodal radiation of esophageal squamous cell carcinoma...
2016: OncoTargets and Therapy
Brian L Day, Timothy Muller, Joanna Offord, Irene Di Giulio
KEY POINTS: When standing, the gain of the body-movement response to a sinusoidally moving visual scene has been shown to get smaller with faster stimuli, possibly through changes in the apportioning of visual flow to self-motion or environment motion. We investigated whether visual-flow speed similarly influences the postural response to a discrete, unidirectional rotation of the visual scene in the frontal plane. Contrary to expectation, the evoked postural response consisted of two sequential components with opposite relationships to visual motion speed...
October 1, 2016: Journal of Physiology
Mo Chen, Bing Li, Jing Guang, Linyu Wei, Si Wu, Yu Liu, Mingsha Zhang
Although the cerebral cortex is thought to be composed of functionally distinct areas, the actual parcellation of area and assignment of function are still highly controversial. An example is the much-studied lateral intraparietal cortex (LIP). Despite the general agreement that LIP plays an important role in visual-oculomotor transformation, it remains unclear whether the area is primary sensory- or motor-related (the attention-intention debate). Although LIP has been considered as a functionally unitary area, its dorsal (LIPd) and ventral (LIPv) parts differ in local morphology and long-distance connectivity...
October 11, 2016: Proceedings of the National Academy of Sciences of the United States of America
Bin Zhou, Ernst Pöppel, Lingyan Wang, Taoxi Yang, Yuliya Zaytseva, Yan Bao
UNLABELLED: Single cases may lead to unexpected hypotheses in psychology. We retrospectively analyzed single case studies that suggested organizational principles along the early visual pathway, which have remained unanswered until now. FIRST CASE: In spite of the inhomogeneity of sensitivity, paradoxically the visual field on the subjective level appears to be homogeneous; constancy of brightness of supra-threshold stimuli throughout the visual field is claimed to be responsible for homogeneity; specific summation properties of retinal ganglion cells are hypothesized to guarantee this effect...
September 2016: PsyCh Journal
Gennady Erlikhman, Gideon P Caplovitz
During dynamic occlusion, an object passes behind an occluding surface and then later reappears. Even when completely occluded from view, such objects are experienced as continuing to exist or persist behind the occluder, even though they are no longer visible. The contents and neural basis of this persistent representation remain poorly understood. Questions remain as to whether there is information maintained about the object itself (i.e. its shape or identity) or, non-object-specific information such as its position or velocity as it is tracked behind an occluder as well as which areas of visual cortex represent such information...
September 20, 2016: NeuroImage
Kathryn A Pitt, Philipp D Mayhew, Michele A Steffey, William T N Culp, Mark C Fuller, Ann Della Maggiore, Richard W Nelson
OBJECTIVE: To report the surgical technique and outcome of dogs undergoing laparoscopic adrenalectomy for removal of unilateral noninvasive pheochromocytoma. STUDY DESIGN: Retrospective case series. ANIMALS: Dogs with unilateral noninvasive adrenal tumors (n=10). METHODS: Medical records of dogs that underwent laparoscopic adrenalectomy for histologically confirmed pheochromocytoma were reviewed. Dogs were positioned in lateral recumbency with the table tilted up to create a semi-sternal position...
September 23, 2016: Veterinary Surgery: VS
Peter Leinen, Stefan Panzer, Charles H Shea
Two experiments utilizing a spatial-temporal movement sequence were designed to determine if the memory of the sequence is lateralized in the left or right hemisphere. In Experiment 1, dominant right-handers were randomly assigned to one of two acquisition groups: a left-hand starter and a right-hand starter group. After an acquisition phase, reaction time (RT) was measured in a recognition test by providing the learned sequential pattern in the left or right visual half-field for 150ms. In a retention test and two transfer tests the dominant coordinate system for sequence production was evaluated...
September 17, 2016: Acta Psychologica
P Walter
Implantable retinal prostheses for the blind are already in use. In blind subjects suffering from retinitis pigmentosa (RP), these systems are able to induce phosphenes. However, the measurable gain in vision is limited. This is due to degeneration in the retina itself and to the technology, which is used in the currently available systems. Research groups and companies are working on solutions and prototypes to improve the outcome of electrical stimulation in the visual system. One improvement will be to enlarge the electrode array in order to restore a larger visual field...
September 19, 2016: Klinische Monatsblätter Für Augenheilkunde
Brian E Russ, Takaaki Kaneko, Kadharbatcha S Saleem, Rebecca A Berman, David A Leopold
UNLABELLED: Visual motion responses in the brain are shaped by two distinct sources: the physical movement of objects in the environment and motion resulting from one's own actions. The latter source, termed visual reafference, stems from movements of the head and body, and in primates from the frequent saccadic eye movements that mark natural vision. To study the relative contribution of reafferent and stimulus motion during natural vision, we measured fMRI activity in the brains of two macaques as they freely viewed >50 hours of naturalistic video footage depicting dynamic social interactions...
September 14, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Yan Huang, Wenqian Wang, Tingting Wu, Li-Ping Xu, Yongqiang Wen, Xueji Zhang
A rapid, sensitive, and accurate detection strategy for microRNA 16 (miR-16) was developed, which combined the convenience of lateral flow biosensors (LFBs), the design flexibility of Y-shaped junction DNA probe, and the enhancement ability of endonuclease-assisted target recycling amplification. The system is composed of a molecular beacon (MB) probe, an assistant probe, and endonuclease Nt.BbvCI, which plays the role of signal translation and amplification. In the presence of the target microRNAs (miRNAs), three chains of nucleic acid could hybridize with each other to form a Y-shaped junction structure, which could be recognized by the endonuclease Nt...
November 2016: Analytical and Bioanalytical Chemistry
Katherine A DeLong, Marta Kutas
With a growing literature demonstrating the predictive nature of language processing, the current study examines contributions of the brain's two hemispheres in processing more and less probable sentence continuations. Specifically, we use the ERP method in conjunction with the visual half-field paradigm to test for hemispheric utilization of sentential constraint to (pre-)activate lexical information and resolve meaning. Taking advantage of the N400's semantic sensitivities, we find support for both hemispheres exhibiting remarkably similar involvement, across a range of message level constraint, in meaning construction...
September 5, 2016: Neuropsychologia
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